NonFatal

expect fun NonFatal(t: Throwable): Boolean(source)

Extractor of non-fatal Throwable. Will not match fatal errors like VirtualMachineError (for example, OutOfMemoryError and StackOverflowError, subclasses of VirtualMachineError), ThreadDeath, LinkageError, InterruptedException. This will also not match CancellationException since that's a fatal exception in Kotlin for cancellation purposes.

Checks whether the passed t Throwable is NonFatal.

Return

true if the provided Throwable is to be considered non-fatal, or false if it is to be considered fatal

import arrow.*
import arrow.core.*

fun unsafeFunction(i: Int): String =
when (i) {
1 -> throw IllegalArgumentException("Non-Fatal")
2 -> throw OutOfMemoryError("Fatal")
else -> "Hello"
}

fun main(args: Array<String>) {
val nonFatal: Either<Throwable, String> =
//sampleStart
try {
Either.Right(unsafeFunction(1))
} catch (t: Throwable) {
if (NonFatal(t)) {
Either.Left(t)
} else {
throw t
}
}
//sampleEnd
println(nonFatal)
}

Parameters

t

the Throwable to check

actual fun NonFatal(t: Throwable): Boolean(source)
actual fun NonFatal(t: Throwable): Boolean(source)
actual fun NonFatal(t: Throwable): Boolean(source)